See merge request nexedi/slapos!1288

This reverts commit 4068fd997566035224ffdf5b3e588c767f840b3f.

component/mca: Move obs files from software/mca
software: Delete "mca".

See merge request !1230

Add support of the message API (send and receive custom messages between drones).

Manual control is used under the hood to set course to coordinates

Use an update loop to decide the instructions to give to the autopilot.

Use a script passed by the user for the flight instead of a predefined one.

security policy.

We want to sort by filename, which is on second column. The previous value
here was just wrong.

There can be a lot of files in the directories leading to Argument list
too long bash error, so switch to method not involving bash expansion.

See merge request nexedi/slapos!1284

Probably I made a mistake when getting adding this md5sum in
70070a61 . This is not a case where the
checksum changed, we did not have checksum before anyway

See merge request !1282

to support git 2.38.1

This is a big changes for users, now typing "python" on the command line
will use system python if it exists or fail with "command not found".

`python3` is set to the SlapOS python from Theia software release.
Recommended approach for python users is either to get used to type
`python3` or to create a virtualenv and use it. With the virtualenv,
they can also install pylint or other linters, so this might be the
best thing to do.

This solves two problems:

First problem is that it makes the embedded SlapOS always have a python
interpreter as `python` in $PATH, which is not always the case in other
SlapOS usage and can hide problems that would cause a software to build
successfully in Theia but not in "bare metal" SlapOS.

Second problem problem is that on python was a interpreter from pygolang
and it is not perfect regarding line edition at least on python 3.8, as
we can observe in this session:

run python and type "something":

```
Python 3.8.13 (default, Sep  6 2022, 10:45:07)
[GCC 8.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> something
             ^ cursor is here, as expected
```

type Ctrl+A to go to beginning of line:

```
Python 3.8.13 (default, Sep  6 2022, 10:45:07)
[GCC 8.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> something
    ^ expected cursor position
^ actual cursor position
```

likewise, type Ctrl+E to go to end of line:

```
Python 3.8.13 (default, Sep  6 2022, 10:45:07)
[GCC 8.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> something
             ^ expected cursor position
         ^ actual cursor position
```

In some cases, for example when the instance does not have internet
access, or to speed up slapos node instance, it's better not to have
frontend requests in the embedded slapos. In this case, the default
slapos proxy behavior of returning a "fake frontend" [1] will apply
and promises checking frontend status will pass anyway.

[1]: see slapos.core commit 2a53efca2 (proxy: bypass simple fronten
requests by returning URL, 2019-03-25)

bring fixes for about 20 CVE